The WiFi based remote control should be a reason by itself. Manual focus with live view on a tablet or your smart phone is incredible. Maybe not for fast types of photography, but for landscapes, portraits and candid photography a.o. this is really more than a gimmick. Other reason: it's sensor. Don't take my word for it, just wait and see. The 5D mk II is maybe for some individual photographers a model with a specific feature you will like, but the large amount of photographers will appreciate the 6D over the 5D mk II.

Smaller size and weight is definitely appreciated and noticeable
High ISO is crazy good
Silent shutter mode is really awesome
Build feels nice
Autofocus is nothing to write home about (although I only ever use the center point)
Remote shooting with the iOS app is awesome...they need to make an iPad version!

eosfun wrote:
The WiFi based remote control should be a reason by itself. Manual focus with live view on a tablet or your smart phone is incredible. Maybe not for fast types of photography, but for landscapes, portraits and candid photography a.o. this is really more than a gimmick.

My suspicion is that the WiFi Live View video signal to your phone/tablet is relatively low resolution, perhaps similar to the 640X480 USB video feed. This resolution may be a practical limit for use of the WiFi for manual focus of Alt lenses, but will be absolutely fine for composition. You can magnify the video image with the camera, but it will still be relatively low resolution feed on a high resolution pad.
The camera LCD has about 1 mp, similar to a basic HD signal. Does you phone or pad with the 6D have equivalent or greater resolution than the camera LCD in Live View?
I would like to be proven wrong.
Mike K

Mike K wrote:
My suspicion is that the WiFi Live View video signal to your phone/tablet is relatively low resolution, perhaps similar to the 640X480 USB video feed. This resolution may be a practical limit for use of the WiFi for manual focus of Alt lenses, but will be absolutely fine for composition. You can magnify the video image with the camera, but it will still be relatively low resolution feed on a high resolution pad.
The camera LCD has about 1 mp, similar to a basic HD signal. Does you phone or pad with the 6D have equivalent or greater resolution than the camera LCD in Live View?
I would like to be proven wrong.
Mike K ...Show more →

Camera LCD does not have 1M pixels - it has 1MP "dots" where each of the R, G and B dots are counted separately - a marketing trick played by manufacturers to make it sound impressive. In reality it is basically a VGA resolution 640x480 screen.

curious80 wrote:
Camera LCD does not have 1M pixels - it has 1MP "dots" where each of the R, G and B dots are counted separately - a marketing trick played by manufacturers to make it sound impressive. In reality it is basically a VGA resolution 640x480 screen.